diff --git a/Classes/Validation/AbstactDomDocumentValidator.php b/Classes/Validation/AbstactDomDocumentValidator.php
index 23466fa0..f5c85b99 100644
--- a/Classes/Validation/AbstactDomDocumentValidator.php
+++ b/Classes/Validation/AbstactDomDocumentValidator.php
@@ -45,6 +45,8 @@ public function __construct()
         parent::__construct(DOMDocument::class);
     }
 
+    abstract public function isValidDocument();
+
     protected function isValid($value): void
     {
         $this->xpath = new DOMXPath($value);
@@ -60,6 +62,4 @@ protected function createNodeValidator(?DOMNode $node): DomNodeValidator
     {
         return new DomNodeValidator($this->xpath, $this->result, $node);
     }
-
-    public abstract function isValidDocument();
 }
diff --git a/Classes/Validation/Dom/DomNodeListValidator.php b/Classes/Validation/Dom/DomNodeListValidator.php
index c69db093..bdbd38b9 100644
--- a/Classes/Validation/Dom/DomNodeListValidator.php
+++ b/Classes/Validation/Dom/DomNodeListValidator.php
@@ -53,7 +53,7 @@ class DomNodeListValidator
     private ?DOMNode $contextNode;
 
     /**
-     * @var DOMNodeList|false|mixed The node list result of XPath query
+     * @var DOMNodeList|false The node list result of XPath query
      */
     private DOMNodeList $nodeList;
 
diff --git a/Classes/Validation/Dom/DomNodeValidator.php b/Classes/Validation/Dom/DomNodeValidator.php
index 3d472fa1..e142e4e8 100644
--- a/Classes/Validation/Dom/DomNodeValidator.php
+++ b/Classes/Validation/Dom/DomNodeValidator.php
@@ -40,6 +40,7 @@
  */
 class DomNodeValidator
 {
+
     /**
      * @var DOMXPath The XPath of document to validate
      */
diff --git a/Tests/Unit/Validation/AbstractDomDocumentValidatorTest.php b/Tests/Unit/Validation/AbstractDomDocumentValidatorTest.php
index c4c2bda0..991f5555 100644
--- a/Tests/Unit/Validation/AbstractDomDocumentValidatorTest.php
+++ b/Tests/Unit/Validation/AbstractDomDocumentValidatorTest.php
@@ -34,6 +34,7 @@
 
 abstract class AbstractDomDocumentValidatorTest extends UnitTestCase
 {
+
     /**
      * @var AbstractDlfValidator
      */